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Vibrational spectroscopic study on degradation of alizarin carmine

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dc.contributor.author Legan, Lea en
dc.contributor.author Retko, Klara en
dc.contributor.author Ropret, Polonca en
dc.date.accessioned 2016-04-07T11:33:15Z
dc.date.available 2016-04-07T11:33:15Z
dc.date.issued 2016
dc.identifier.citation Legan, Lea, Retko, Klara, and Ropret, Polonca. 2016. "<a href="https%3A%2F%2Frepository.si.edu%2Fhandle%2F10088%2F28311">Vibrational spectroscopic study on degradation of alizarin carmine</a>." <em>Microchemical Journal</em>. 127:36&ndash;45. <a href="https://doi.org/10.1016/j.microc.2016.02.002">https://doi.org/10.1016/j.microc.2016.02.002</a> en
dc.identifier.issn 0026-265X
dc.identifier.uri https://hdl.handle.net/10088/28311
dc.description.abstract Identification of organic dyes together with possible degradation products is often complicated in the field of cultural heritage. The main focus of this work is utilization and comparison between non-invasive reflection infrared spectroscopy, transmission infrared spectroscopy, and surface-enhanced Raman spectroscopy (SERS), a minimally invasive technique in order to understand the ageing behaviour of paint layers containing organic dye alizarin carmine (alizarin red S, sodium alizarin sulfonate, ARS) in lipid and proteinaceous binder. The results obtained with both Fourier transform infrared (FTIR) spectroscopies highlight a significant degradation of ARS paint layers where changes in hydroxyl, sulfonate, and carbonyl groups of alizarin red S were observed. In most of the cases, the intensity of IR bands belonging to the degraded alizarin red S was so weak or shifted that would make its positive identification questionable in an unknown sample. After all, it was apparent that SERS is a powerful technique to detect even the trace ARS molecules. Furthermore, degradation was even more pronounced for the paint layers of ARS combined with linseed oil. Namely, a transparent white layer of sodium sulfate was formed above the aged ARS glaze layer. en
dc.relation.ispartof Microchemical Journal en
dc.title Vibrational spectroscopic study on degradation of alizarin carmine en
dc.type Journal Article en
dc.identifier.srbnumber 139121
dc.identifier.doi 10.1016/j.microc.2016.02.002
rft.jtitle Microchemical Journal
rft.volume 127
rft.spage 36
rft.epage 45
dc.description.SIUnit MCI en
dc.description.SIUnit Peer-reviewed en
dc.citation.spage 36
dc.citation.epage 45

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